compiler/stdc/math/s_catanhf.c

   1 /*      $OpenBSD: s_catanhf.c,v 1.1 2008/09/07 20:36:09 martynas Exp $  */
   2 /*
   3  * Copyright (c) 2008 Stephen L. Moshier <steve@moshier.net>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /*                                                      catanhf
  19  *
  20  *      Complex inverse hyperbolic tangent
  21  *
  22  *
  23  *
  24  * SYNOPSIS:
  25  *
  26  * float complex catanhf();
  27  * float complex z, w;
  28  *
  29  * w = catanhf (z);
  30  *
  31  *
  32  *
  33  * DESCRIPTION:
  34  *
  35  * Inverse tanh, equal to  -i catan (iz);
  36  *
  37  * ACCURACY:
  38  *
  39  *                      Relative error:
  40  * arithmetic   domain     # trials      peak         rms
  41  *    IEEE      -10,+10     30000       2.3e-16     6.2e-17
  42  *
  43  */
  44
  45 #include <complex.h>
  46 #include "math.h"
  47
  48 float complex
  49 catanhf(float complex z)
  50 {
  51         float complex w;
  52
  53         w = -1.0f * I * catanf (z * I);
  54         return (w);
  55 }